'hpPostProcessing.bundle' malware?

Well I have already fixed the issue and am not going to install another fix on top of it. Especially given the facts that there is no comment from Apple, no consistent comment from HP and mixed messages from people who have tried the 'fix' you are reporting.

mixed messages from people who have tried the 'fix' you are reporting.

They're mixed because this just happened Friday, and information on it kept changing. The A, B, C steps are the best we know at this time. It's working for just about everyone.

I deleted the printer in preferences, reinstalled the driver from this page: https://support.hp.com/in-en/document/c05900790, reconnected the printer and now it works. I have a Laserjet P2015dn printer. Hope it works for other people

There are links posted above for two sets of Drivers.

• For "dumb" inkjet printers, use the link that starts with ftp:

• For smarter printers and laserjets, use the link for Drivers version 5.1

In either case, you must delete you old print queue and AFTER download re-add a new Print queue, which will then incorporate the new drivers.

Another fix we have recently found is to delete the HP folder located in users library-printers, empty the trash bin and then restart the machine. After restarting the machine in printer & scanners delete the HP printer and reinstall using IP using the HP Jetdirect - Socket protocol. You will then be promoted if you would like to download the driver from apple. Once downloaded, the correct driver will be auto selected and you are able to print. I have done this on 3 Macs now running 10.15.7.

I have the same problem in trying to print from HP Color LaserJet 2025 with the alarm message: “hpPostProcessing.bundle” will damage your computer. I have downloaded printer software 5.0 but this has not solved the problem. This seems to have occurred after the latest software update.

This is not helpful. HP say contact apple. As this error occurred with the latest Apple system update, it is Apples responsibly to post a clear solution. I downloaded the HP driver & scanner update, but still the malware message. I had to go and buy a different printer because I needed printing & scanning today, not next week.

I had the urgent need to scan and print within two hours this morning. I spent one hour downloading & installing the new HP drivers. The scanner still would not work. Traipsing to the computer shop & getting a new scanner/printer was the only practical solution within the time available.

I expect my IT to work when I need it, how I need it. This was yet another unwelcome surprise from apple. I will probably get deleted from the forums if I say that I also had to buy a cheap PC to get around the problem in the time available.

Now I have "spare" hours this evening I might be able to have the time to get my mac working

As well as deleting printers some people have not bothered with the download but deleted the hp driver for their printer from /Library/Printers/.../PPDs. The installer will fetch an updated signed driver when needed.

this approach (which I used) means you do not need to download the hp drivers stuff described above.

I just tried that link. I clicked on the pkg and get the same malware error message emerging repeatedly! I updated to the 10.15.7 (19H15) latest release two days ago.

If I had 12 hours I would restore an old build from backup, but this would take me over 12 hours.

I deleted the Printer Queue, deleted the Printer in Settings. Installed Update 5.1. Restarted the Mac.

Going into printers, none displayed. Click + to install a new printer. And a version of the same error shows up.

Help?

Thanks

The first couple of times around, I tried running HP UN-Installer, but it didn't work. The icon bounced around on the dock, but nothing else happened.

I just tried it again, and it worked. Shrug.

I think it's one of those magic things that happens when I ask for help. The computer gods out there straighten things out, when it's not just me they are messing with.

Thank you for the help, Grant.

Appreciate your expertise and sharing.

Have a terrific 2021

Breathe

HP appears to have taken a major step BACK away from supporting their older "dumb" printers (that do imaging on the computer instead of imaging in the printer), especially the mess they sent into the marketplace with special drivers for only one model. Faced with updating a lot of different software to run with Big Sur, they instead asked Apple to de-authorize all their old drivers.

Their network-capable "smart" printers (with PCL or Postscript support) work fine with updated drivers.

There's a workaround here: Sudden Problem with Printing

Wiping out the old HP drivers (delete the folder in Finder) and installing the HP Printer Drivers v5.1 for OS X did the trick for me! Working off an old HP Laserjet 1022n.